Last week, Facebook unveiled its latest attempt to rein in its flagship product. In an effort to curb false news, it announced it would be allowing Facebook users to rank news outlets by trustworthiness, and consider those scores when deciding which news stories to display in users’ feeds. But this kind of minor algorithmic knob-fiddling may not be enough. Instead, Facebook should consider using what it’s learned with Instagram, which it acquired in 2012, to embark on a gut renovation.